CN202350869U - Oil-water interface measuring device - Google Patents

Abstract

The utility model relates to an oil-water interface measuring device comprising an optical sensing probe, a light source, a photoelectric detection device and an alarm device, wherein the optical sensing probe comprises a pentaprism structure, incidence end fiber, exit end fiber, a first collimator arranged on the incidence end fiber, and a second collimator arranged on the exit end fiber; and the pentaprism structure comprises a closed pentagon defined by a first refection edge, a second refection edge, a third refection edge, a fourth refection edge and a fifth refection edge which is a horizontal edge. The oil-water interface measuring device can be used for solving the technical problem that due to the low precision of the existing measurement on an oil-water interface, normal operation of production can not be ensured, realizing the measurement on a multi-point-distribution oil-water interface, and enhancing the detection precision of the oil-water interface.

Description

A kind of water-oil interface measurement mechanism

Technical field

The utility model belongs to the oil detection range, relates in particular to a kind of water-oil interface measurement mechanism.

Background technology

In the petroleum storage tank; The bottom of jar has the water of certain altitude usually; To accurately assess in the oil tank what of oil, need the position of water-oil interface be judged accurately that the measurement overwhelming majority of present oil-water contact adopts the method for hand gauging and analytical test.The detection means of this backwardness, measuring accuracy is low, can't guarantee the normal operation of producing, let alone Optimizing operation, makes production operation and management decision have very big blindness.The automatic problems of measurement that how to solve petroleum storage tank is to improve a gordian technique of crude oil transmission automatization level.

Summary of the invention

The technical matters of, the normal operation that can't guarantee produce low for the measuring accuracy that solves existing water-oil interface, the utility model provides a kind of water-oil interface measurement mechanism.

The technical solution of the utility model:

The water-oil interface measurement mechanism comprises optical sensing probe, light source, Electro-Optical Sensor Set and warning device,

Its special character is: said optical sensing probe comprises pentaprism structure, incident end optical fiber, exit end optical fiber, is arranged on first collimating apparatus on the incident end optical fiber and is arranged on second collimating apparatus on the exit end optical fiber,

Said light source inputs to the pentaprism structure through first collimating apparatus, and said pentaprism structure exports Electro-Optical Sensor Set to through second collimating apparatus, and said Electro-Optical Sensor Set is connected with warning device,

Said pentaprism structure comprises the sealing pentagon that the first reflection limit a, the second reflection limit b, the 3rd reflection limit c, the 4th reflection limit d and the 5th reflection limit e surround, and wherein the 5th reflection limit e is a horizontal sides,

Angle between the first reflection limit a and the second reflection limit b is θ 2; Angle between the second reflection limit b and the 3rd reflection limit c is θ 3; Angle between the 3rd reflection limit c and the 4th reflection limit d is θ 4; Angle between the first reflection limit a and the 5th reflection limit e is that the angle between θ 1, the five reflection limit e and the 4th reflection limit d is θ 5

Relation: α 1≤θ 1≤α 2 below satisfying; θ 5=θ 1; θ 3=θ 4=θ 2=2 θ 1; Wherein: α 1 must satisfy incident angle for total reflection takes place in the air:

α 2 is not for satisfying the total reflection condition incident angle in oil:

The refractive index of air: n ₀

The refractive index of oil: n ₁

The refractive index of prism: n ₂

Above-mentioned water-oil interface measurement mechanism also comprises oil-filtering apparatus, and said oil-filtering apparatus is placed in and is fixed on the optical sensing probe,

Said oil-filtering apparatus comprises the hollow ampuliform housing of an end opening, and the bottom of said housing 15 is laid with the oil strain hole, and said housing is provided with vent port near a distolateral wall of opening.

Above-mentioned pentaprism is adopted structure and is adopted K9 glass,

Said pentaprism is adopted structure and is adopted K9 glass,

Then 39.8 °≤θ is 1≤70.44 °,

79.6°≤θ3＝θ4＝θ2≤140.88°，θ5＝θ1。

Above-mentioned pentaprism is adopted structure and is adopted K9 glass, gets θ 1=67.5 °, can calculate 4=135 ° of θ 2=θ 3=θ according to this, 1=67.5 ° of θ 5=θ.

Above-mentioned housing is provided with the oil strain hole near the sidewall of housing bottom.

The advantage that the utility model had:

1, the utility model employing electro-optical system is measured, and the electro-optical system response time is short, and system sensitivity is high, and the combination of a plurality of probe can realize the measurement of multiple spot distribution water-oil interface.

When 2, using the utility model optical sensing probe is comprised the pentaprism result; Place oil tank to remove to detect water-oil interface the optical sensing probe, oily to contact from air when the optical sensing probe, the system signal lamp becomes flicker by standby; The system signal lamp immediately becomes standby when probe touches water-oil interface; Stop to report to the police, prompting has touched water-oil interface, accurately judges the position of water-oil interface.

3, the utility model in the outer socket of optical sensing probe an oil-filtering apparatus, utilize oil-filtering apparatus to destroy the bigger oil film of water-oil interface formation layer of surface tension force during detection, detect then, improved the accuracy of detection of water-oil interface.

4, the utility model compare with the radar level gauging device have passive (safe) but, do not receive electromagnetic interference (EMI) long-distance transmissions and monitoring, highly sensitive, do not have blind area, simple installation, price is low, volume is little etc. advantage.

Description of drawings

Fig. 1 is the water-oil interface measurement mechanism principle schematic of the utility model;

Fig. 2 is the structural representation of the water-oil interface measurement mechanism of the utility model;

Fig. 3 is the structural representation of the utility model oil-filtering apparatus,

Fig. 4 is the right view of Fig. 3;

Fig. 5 is the structural representation of the utility model optical sensing probe;

Fig. 6 is the optical sensing probe synoptic diagram of a kind of embodiment of the utility model;

Wherein Reference numeral is: 1-light source, 2-optical fiber, 3-first collimating apparatus, 4-pentaprism structure, 5-second collimating apparatus; The 7-photodetector, 8-warning device, 9-oil, 10-oil tank, 11-water; The 12-oil-filtering apparatus, 13-oil strain hole, 14-vent port, 15-housing, 16-optical sensing probe.

Embodiment

1 optical fibers formula water-oil interface measurement mechanism as shown in the figure, utilize optical sensing pop one's head in 16 surrounding medium refractive indexes difference and produce the principle of Fresnel reflection; The light that light source 1 sends is transferred to the collimation that first collimating apparatus 3 realizes light through optical fiber 2; And collimated light impinged perpendicularly in the pentaprism structure 4, light in pentaprism structure 4 through four Fresnel reflections, again by 5 outgoing of second collimating apparatus; After optical fiber 2 transmission; Get into photodetector 7, drive alarm 8 and signal lamp warning through photoelectric switching circuit, to realize the detection of liquid level.When the optical sensing probe places air, satisfy the Fresnel reflection condition, from second collimating apparatus 5 light output is arranged, system is in holding state; Touch probe and work as 9 one of oil, because the refractive index of oil does not satisfy the Fresnel reflection condition greater than air; There is not light output in second collimating apparatus 5; The detection system signal lamp glimmers immediately and sends alarm sound, when the optical sensing probe continues to touch water-oil interface downwards, satisfies the condition of Fresnel reflection once more; Detection system is in holding state once more, can accurately judge the position of water-oil interface thus.

Because optical sensing probe will satisfy simultaneously and in oil, total reflection not take place and total reflection all takes place in water and air, so the optical sensing probe adopts the pentaprism structure:

The pentaprism structure comprises the sealing pentagon that the first reflection limit a, the second reflection limit b, the 3rd reflection limit c, the 4th reflection limit d and the 5th reflection limit e surround, and wherein the 5th reflection limit e is a horizontal sides,

Angle between the first reflection limit a and the second reflection limit b is θ 2; Angle between the second reflection limit b and the 3rd reflection limit c is θ 3; Angle between the 3rd reflection limit c and the 4th reflection limit d is θ 4; Angle between the first reflection limit a and the 5th reflection limit e is that the angle between θ 1, the five reflection limit e and the 4th reflection limit d is θ 5

θ 1 satisfies: α 1≤θ 1≤α 2

Total reflection takes place in air must satisfy incident angle:

$\mathrm{\&alpha;}1\&GreaterEqual;\arcsin \frac{n_0}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000117704920000011.png"\; state="\{\{state\}\}">n</figure-callout>}}_2}$

In oil, do not satisfy the total reflection condition incident angle:

$\mathrm{\&alpha;}2\&le;\arcsin \frac{n_1}{{\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000117704920000011.png"\; state="\{\{state\}\}">n</figure-callout>}}_2}$

The refractive index of air: n ₀

The refractive index of oil: n ₁

The refractive index of prism: n ₂

Incident angle θ 1 will satisfy greater than the big person among α 1, the α 3 less than the value of α 2, because light at a, b, c, d face above-mentioned total reflection condition will take place all, can be calculated by above-mentioned principle and calculate θ 2, θ 3, θ 4, θ 5 according to this.

θ5＝θ1；

θ2＝2θ1；

θ3＝θ4＝θ2。

For example: if prism adopts K9 glass

The refractive index of air: n ₀=1

The refractive index of water: n ₁=1.33

The refractive index of oil: n ₂=1.47

The refractive index of prism: n ₃=1.56

Calculating can get:

α1≥39.8°

α2≤70.44°

α3≥58.49°

1≤70.44 ° of 58.49 °≤θ of incident angle gets θ 1=67.5 °, can calculate 4=135 ° of θ 2=θ 3=θ according to this, 1=67.5 ° of θ 5=θ.

Consider in the long-term contact of water-oil interface, can form the bigger oil film of layer of surface tension force, directly measure the position that often can not accurately measure the interface with probe at water-oil interface; The utility model has adopted a kind of oil-filtering apparatus 12, can destroy the accurate measurement that oil film can be realized water-oil interface again, and optical sensing probe 16 is packed in the oil-filtering apparatus 12; And be fixed, when oil-filtering apparatus 12 1 touched oil, oil got into from the oil strain hole immediately and destroys oil film; Air in the oil-filtering apparatus 12 is exported from vent port, and with oil tank in liquid level form UNICOM, when oil-filtering apparatus 12 when touching water-oil interface; The oil strain hole can destroy the water-oil interface oil film immediately; Probe one touches water-oil interface, satisfies total reflection condition immediately, and warning stops; Prompting just arrives the water-oil interface position, can accurately calculate oil level and oil mass in the jar thus.

Oil-filtering apparatus is placed in and is fixed on the optical sensing probe, and referring to Fig. 3, oil-filtering apparatus comprises the hollow ampuliform housing of an end opening, and the bottom of housing is laid with the oil strain hole, and housing is provided with vent port near a distolateral wall of opening.For the quick broken film of changing oil, also be provided with the oil strain hole near the sidewall of bottom at housing.During use, opening up.

Claims (5)

1. the water-oil interface measurement mechanism comprises optical sensing probe, light source, Electro-Optical Sensor Set and warning device,

It is characterized in that: said optical sensing probe comprises pentaprism structure, incident end optical fiber, exit end optical fiber, is arranged on first collimating apparatus on the incident end optical fiber and is arranged on second collimating apparatus on the exit end optical fiber,

Said light source inputs to the pentaprism structure through first collimating apparatus, and said pentaprism structure exports Electro-Optical Sensor Set to through second collimating apparatus, and said Electro-Optical Sensor Set is connected with warning device,

Said pentaprism structure comprises the sealing pentagon that the first reflection limit (a), the second reflection limit (b), the 3rd reflection limit (c), the 4th reflection limit (d) and the 5th reflection limit (e) surround, and wherein the 5th reflection limit (e) is a horizontal sides,

Angle between the first reflection limit (a) and the second reflection limit (b) is θ 2; Angle between the second reflection limit (b) and the 3rd reflection limit (c) is θ 3; Angle between the 3rd reflection limit (c) and the 4th reflection limit (d) is θ 4; Angle between the first reflection limit (a) and the 5th reflection limit (e) is that the angle between θ 1, the five reflection limit (e) and the 4th reflection limit (d) is θ 5

Relation: α 1≤θ 1≤α 2 below satisfying; θ 5=θ 1; θ 3=θ 4=θ 2=2 θ 1;

Wherein: α 1 must satisfy incident angle for total reflection takes place in the air:

α 2 is not for satisfying the total reflection condition incident angle in oil:

The refractive index of air: n ₀

The refractive index of oil: n ₁

The refractive index of prism: n ₂

2. water-oil interface measurement mechanism according to claim 1 is characterized in that: also comprise oil-filtering apparatus, said oil-filtering apparatus is placed in and is fixed on the optical sensing probe,

Said oil-filtering apparatus comprises the hollow ampuliform housing of an end opening, and the bottom of said housing (15) is laid with the oil strain hole, and said housing is provided with vent port near a distolateral wall of opening.

3. water-oil interface measurement mechanism according to claim 1 and 2 is characterized in that: said pentaprism is adopted structure and is adopted K9 glass,

Said pentaprism is adopted structure and is adopted K9 glass,

Then 39.8 °≤θ is 1≤70.44 °,

79.6°≤θ3＝θ4＝θ2≤140.88°，θ5＝θ1。

4. water-oil interface measurement mechanism according to claim 3 is characterized in that: said pentaprism is adopted structure and is adopted K9 glass, gets θ 1=67.5 °, can calculate 4=135 ° of θ 2=θ 3=θ according to this, 1=67.5 ° of θ 5=θ.

5. water-oil interface measurement mechanism according to claim 4 is characterized in that: said housing is provided with the oil strain hole near the sidewall of housing bottom.

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